Vacuum cleaner



FIG. 1 is a perspective view of the vacuum cleaner according to the present design;

FIG. 2 is a top plan view of the vacuum cleaner;

FIG. 3 is a left side view;

FIG. 4 is a bottom plan view;

FIG. 5 is a right side view;

FIG. 6 is a rear elevation view; and,

FIG. 7 is a front elevation end view. 

The ornamental design for a vacuum cleaner, as shown and described. 